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A <br /> Harding Lawson Associates <br /> storage bag, and stared in an ice chest with blue ice until delivery under chain of <br /> custody to the analytical laboratory. All soil samples were collected in accordance with <br /> RWQCB guidelines. <br /> 4 <br /> Once the confirmation soil samples were collected, logs of the excavation walls <br /> were prepared by the HLA geologist. 'The soils exposed in the excavation walls were <br /> logged in accordance with the Unified Soil Classification System (ASTM D2487-85, <br /> Plate 4) under the supervision of a California registered geologist. The excavation wall <br /> logs are presented on Plate 5. <br /> { <br /> 1 5.3 Stockpile Sampling UNuO <br /> After completion of the excavation and sampling, the stockpiles were sampled to <br /> characterize the petroleum hydrocarbon concentrations of the soil. This information will <br /> be used to evaluate the disposal options for the soil. The stockpiled soil was monitored <br /> t <br /> for the presence of organic vapors with an OVA and four soil samples were collected <br /> from each stockpile. The samples were collected at locations which, on the basis of the <br /> OVA readings, contained hydrocarbon concentrations that represented the average <br /> concentration of the pile. The soil samples were collected by first scraping 0.5 feet of <br /> soil from the surface of the stockpile and then pushing a clean stainless steel tube into <br /> the material until it was completely full. The sample tubes were stored and transported <br /> as described above. Following the sampling the stockpiles were covered with visqueen <br /> and a temporary fence constructed around the excavation. <br /> 5.4 Laboratory Analyses <br /> Soil samples collected from the excavation floors and walls, and from the <br /> stockpiles were submitted for chemical analysis. The soil samples were analyzed for <br /> l� <br /> i <br /> T19461-H 11 of 20 <br /> �k <br />